How do you get cellular data coverage for an IOT device and how come the website says that it would only cost at most a couple of dollars a month? Which networks have a plan for hackers?
1nce [0] and Hologram [1] offer low cost SIM cards for these type of applications.
1nce for example charges €10 for 500MB of data which lasts 10 years. Assuming you are economical with the data it's €1 a year, which is a very appealing price point. Even if you need 500MB a year that's still less than €1 a month.
Hologram charge by the MB (although I'm not sure exactly how much as their pricing page isn't fully transparent), with a 70¢ a month charge per SIM card. I think they offer a free SIM card with a certain amount of data a month free (maybe 1MB) if you just want 1 SIM card.